Good question. I was just thining the same thing yesterday.
How do I stop chess.com from sending me so many messages about team matches?

Go to the group home page. Scroll down until you see Alerts. Click which notifications you want.
Thanks.
It took me a bit to find it.
It is in the right-hand column in the grey box.

yo guess i reached to the party a few mins late..........neverming=d that
anyways i wanted to ask......is the chesscom account a bot cause it sends u messages so reggularly,but also i can see it has played so many matches

yo guess i reached to the party a few mins late..........neverming=d that
anyways i wanted to ask......is the chesscom account a bot cause it sends u messages so reggularly,but also i can see it has played so many matches
It's an account used for site messages. It's possible that staff members occasionally forgot they were in that account when starting a game.
Chess.com always sends me at least fifty team match messages a day I like being in groups, but I don't want so many messages.